mysqlがエラーが発生してしまいサーバーが起動できません。

'mysql' => [
            'driver' => 'mysql',
            'url' => env('DATABASE_URL'),
            'host' => env('DB_HOST', '127.0.0.1'),
            'port' => env('DB_PORT', '8889'),
            'database' => env('DB_DATABASE', 'localhost'),
            'username' => env('DB_USERNAME', 'root'),
            'password' => env('DB_PASSWORD', 'root'),
            'unix_socket' => env('DB_SOCKET', '/Applications/MAMP/tmp/mysql/mysql.sock'),
            'charset' => 'utf8mb4',
            'collation' => 'utf8mb4_unicode_ci',
            'prefix' => '',
            'prefix_indexes' => true,
            'strict' => true,
            'engine' => null,
            'options' => extension_loaded('pdo_mysql') ? array_filter([
                PDO::MYSQL_ATTR_SSL_CA => env('MYSQL_ATTR_SSL_CA'),
            ]) : [],
        ],

DB_CONNECTION=mysql
DB_HOST=127.0.0.1
DB_PORT=8889
DB_DATABASE=localhost
DB_USERNAME=root
DB_PASSWORD=root

DB_CONNECTION=mysql
DB_HOST=127.0.0.1
DB_PORT=8889
DB_DATABASE=localhost
DB_USERNAME=root
DB_PASSWORD=root

 php artisan migrate

   Illuminate\Database\QueryException 

  SQLSTATE[HY000] [1049] Unknown database 'localhost' (SQL: select * from information_schema.tables where table_schema = localhost and table_name = migrations and table_type = 'BASE TABLE')

  at vendor/laravel/framework/src/Illuminate/Database/Connection.php:678
    674▕         // If an exception occurs when attempting to run a query, we'll format the error
    675▕         // message to include the bindings with SQL, which will make this exception a
    676▕         // lot more helpful to the developer instead of just the database's errors.
    677▕         catch (Exception $e) {
  ➜ 678▕             throw new QueryException(
    679▕                 $query, $this->prepareBindings($bindings), $e
    680▕             );
    681▕         }
    682▕ 

      +33 vendor frames 
  34  artisan:37
      Illuminate\Foundation\Console\Kernel::handle(Object(Symfony\Component\Console\Input\ArgvInput), Object(Symfony\Component\Console\Output\ConsoleOutput))

SQLSTATE[HY000] [1049] Unknown database 'my_app_db' (SQL: select * from information_schema.tables where table_schema = localhost and table_name = migrations and table_type = 'BASE TABLE')

CREATE DATABASE my_app_db; EXIT;